Charles e



(No Model.)

0. E. SCRIBNER. ELECTRIC ARC LAMP.

No. 476,493. Patented June 7, 1892.

UNITED STATES PATENT O EIcE.

CHARLES E. SCRIBNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE IVESTERN ELECTRIC COMPANY, OF SAME PLACE.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 476,498, dated June '7, 1892. Application filed October 13, 1891- Serial No. 408,586. (No model.)

To aZZ whom it may concern: the carbon-rod. Thus the single electro-mag- Be it known that I, CHARLES E. SCRIBNER, a net in causing a continuous movement of its citizen of the United States, residing at Chiarmature toward it performs the two distinct cago,in the county of Cook and State of Illifunctions of first separating the carbons to 5 5 nois, have invented a certain new and useful form the arc and subsequently causing them Improvement in Electric-Arc Lamps, (Case to approach to regulate the length of the are. 278,) of which the following is a full, clear, Itis desirablethattheelectro-magnet should concise, and exact description, reference benot shunt any considerableportion of the curing had to the accompanying drawing, formrent from the arc,and hence that it should be 60 1o ing apart of this specification. of high resistance. In practice, to accom- My invention relates to electric-arc lamps. plish this end, while still insuring that suffi- Its object is to provide regulating mechanism cient current shall traverse the magnet before in which a single electro-magnet in shunt of the carbons are separated, I preferably inthe carbons acts to form and subsequently to elude a resistance in the main circuit within 6 regulate the length of the arc. the shunt and provide contact-points in con- My improved lamp mechanism consists,'esnection with the centrallypivoted lever,

sentially, of a centrally-pivoted lever whose adapted to close a short circuit about the said extremities are adapted to engage with a secresistance when the carbons have been sepaond lever pivoted at one extremity at differrated to a sufficient distance. 70

out distances, respectively, from its pivotal My invention is illustrated in the accompoint; an electro-magnet in shunt of the arc, panying drawing and may be more readily adapted to rotate the centrally-pivoted lever understood by reference thereto. in one direction; a spring tending to rotate In the drawing I have shown the mechansaid lever in the opposite direction, and a secism and circuits diagrammatically.

2 0nd spring acting to press the end-pivoted lea is the lever pivoted at one end a to the ver toward the centrally-pivoted lever. The frame I) of the lamp and in connection at its said end-pivoted lever atits free extremity other extremity with the clutch (Z, of wellis connected with the clutching mechanism, known form. A carbon-rod 6 passes through of any well-known form, grasping a rod can and is adapted to be grasped by the clutch (Z. 80

o rying one of the carbons of the lamp. The The rod (2 carries at its lower end the upper parts described are so disposed that when the carbon f of the pair f f. The lower carbon electro-magnet is not energized the spring atf is rigidly secured to the base [1' of the lamp. tached to the centrally-pivoted lever causes g is the centrally-pivoted lever, pivoted the latter to exert a'pressure upon the endat 7L. It is provided with three arms g 3 5 pivoted lever through that end actingnearer One 9 carries at its upper extremity the arthe fulcrum to maintain the said end-pivoted mature z. The remaining two 9 are d lever in position to cause the release of the ed to engage with the lever to at points at difcarbon rod. \Vhen, however, the magnet beferent distances, respectively, from its fulcomes energized,the armature attached to the crum a. A spring 70 or its equivalent exerts o 40 centrally-pivoted lever is attracted. In its an upward pressure upon lever a, tending to first motion it allows the two levers to apraise the clutch (Z, and with it the carbon-rod preach parallelism,thereby allowing the end- 6, and maintaining itin engagement with one pivoted lever to rise in response to the press or the other of the arms g A Second ure of the second spring described, and thus spring Z, attached to lever 9, acts to maintain 5 5 to separate the carbons to form the arc. \Vhen the armaturez' separated from its magnet and under the action of the electro-magnet the to depress the lever a through the medium of centrally-pivoted lever has rotated through a arm 9 in opposition to spring 7r. certain distance, the other extremity thereof m is the electro-magnet, of high resistanc comes into engagement with the end-pivoted and in shunt of the carbons, adapted to act I00 lever and as the rotation continues forces the upon armature e in opposition to spring Z.

latter lever into position to lower or release it is a resistance interposed in the main circuit within the shunt of the electro-magnet, and 0 is a contact-point upon the lever g, adapted to close upon the fixed contact-anvil o and thus to short-circuit resistance a. The contact 0 is mounted upon a yielding arm, in order that the further forward movement of the lever may not be impeded when the piece 0 has reached the anvil 0.

When the lamp is idle, the lever a is depressed by the action of spring Z, as described, and allows the upper carbon to rest in contact with the lower. Current upon entering the lamp finds circuit through the parallel branches, resistance a, carbon-rod c, carbons f f, and out, and through magnet m out. Magnet m is thus energized and attracts its armature i, producing a movement of lever g such as to allow lever to to rise. The rise of lever (1 causes the upper carbon to be separated from the lower, and the arc is thus formed. At the same time the contact-piece 0 closes upon its anvil 0', short-circuiting resistance a; but, owing to theresistance of the arc, the magnet on is not de-energized. As the arc increases in resistance the magnet m is more strongly energized and draws its armature still nearer to it, until the arm of lever g engages with the lever a and depresses it, thus allowing the approach of the upper carbon toward the lower, or, if the motion of g be suflicient in extent, the release of rod c by the clutch d.

Obviously forms of levers other than those described might be devised to perform the same functions and other disposition of the contacts 0 0' might be made without departing from the essence of my invention. Hence I do not limit myself to the precise form shown; but

I claim as new and desire to secure by Letters Patent 1. The combination, with the lever a, pivoted at one end and adapted to impart motion to one of a pair of carbons, of a lever g, pivoted at or near its center and having its extremities g g adapted to engage with the end-pivoted lever a, an electro-magnet in shunt of the carbons, adapted to impart motion to the centrally-pivoted lever g, a spring Z, acting in opposition to the magnet m upon the lever gfand a spring 7;, acting upon the end-pivoted lover a to cause a separation of the carbons, substantially as described.

2. The combination of an end-pivoted lever adapted to impart motion to one of a pair of carbons with a lever pivoted at or near its center and having its extremities adapted to act independently of each other upon said endpivoted lever, and a spring or its equivalent acting to maintain said end-pivoted lever in engagement with one of the extremities of said centrally-pivoted lever, whereby the mechanism is adapted to resolve continuous motion in one direction of the centrally-pivoted lever into motions of one of the carbons in successively-opposite directions, substantially as described.

3. The combination of an end-pivoted lever, in connection with mechanism whereby it acts to impart motion to one of a pair of carbons, with a lever pivoted at or near its center and having its extremities adapted to act independently of each other upon said end-pivoted lever, a spring or equivalent acting to maintain said end-pivoted lever in engagement with one of the extremities of said centrally-pivoted lever, an armature in connection with said centrally-pivoted lever, and an electro-magnet in shunt of said pairof carbons adapted to act upon said armature, whereby said electro-magnet in producing a continuous approaching movement of its armatureis adapted to cause motions of the said carbons in successively-opposite directions, substantially as described.

at. The combination, with the end-pivoted lever a, actuating one carbon f of a pair ff, of the centrally-pivoted lever g, the spring 7.2, the armature i, electro-magnet m in shunt of said carbons, resistance a in series with said carbons and within the shunt m, and contacts 0 0, adapted to be closed by the movement of lever g and when closed to complete a short circuit about resistance a, substantially as described.

In witness whereof I hereunto subscribe my name this 14th day of September, A. D. 1891.

CHARLES E. SCRIBNER. Witnesses:

FRANK R. MOBERTY, GEORGE L. CRAGG. 

